Final answer:
The Hohokam of North America and the ancient Mesopotamians were alike in that both civilizations developed and used irrigation systems to support their agricultural practices.
Step-by-step explanation:
The similarity between the Hohokam of North America and the ancient Mesopotamians is that both used irrigation. The Hohokam, known for inhabiting what is now the southwestern United States, created an extensive irrigation system to cultivate their crops in the arid environment. In contrast, the ancient Mesopotamians, located in the fertile crescent region which is now mostly Iraq, also famously developed irrigation techniques to manage the unpredictable flooding of the Tigris and Euphrates rivers, channeling the water to support their agriculture and the emergence of early urban centers. Both civilizations relied on these sophisticated irrigation systems to support their farming practices and, thus, their societies.